import {wx} from '../../../../weixin2alipay/index.js';
import {Page,Component} from '../../../../weixin2alipay/index.js';
const vs = `
  attribute vec3 aPos;
  attribute vec2 aVertexTextureCoord;
  varying highp vec2 vTextureCoord;

  void main(void){
    gl_Position = vec4(aPos, 1);
    vTextureCoord = aVertexTextureCoord;
  }
`;
const fs = `
  varying highp vec2 vTextureCoord;
  uniform sampler2D uSampler;

  void main(void) {
    gl_FragColor = texture2D(uSampler, vTextureCoord);
  }
`;
const vertex = [
  - 1,
  - 1,
  0.0,
  1,
  - 1,
  0.0,
  1,
  1,
  0.0,
  - 1,
  1,
  0.0
];
const vertexIndice = [
  0,
  1,
  2,
  0,
  2,
  3
];
const texCoords = [
  0.0,
  0.0,
  1.0,
  0.0,
  1.0,
  1.0,
  0.0,
  1.0
];
function createShader(gl,src,type){
  const shader = gl.createShader(type);
  gl.shaderSource(shader,src);
  gl.compileShader(shader);
  if(! gl.getShaderParameter(shader,gl.COMPILE_STATUS))
    {
      console.error('Error compiling shader: ' + gl.getShaderInfoLog(shader));
    };
  return shader;
};
const buffers = {};
function createRenderer(canvas,width,height){
  const gl = canvas.getContext("webgl");
  if(! gl)
    {
      console.error('Unable to get webgl context.');
      return;
    };
  const info = wx.getSystemInfoSync();
  gl.canvas.width = info.pixelRatio * width;
  gl.canvas.height = info.pixelRatio * height;
  gl.viewport(0,0,gl.drawingBufferWidth,gl.drawingBufferHeight);
  const vertexShader = createShader(gl,vs,gl.VERTEX_SHADER);
  const fragmentShader = createShader(gl,fs,gl.FRAGMENT_SHADER);
  const program = gl.createProgram();
  gl.attachShader(program,vertexShader);
  gl.attachShader(program,fragmentShader);
  gl.linkProgram(program);
  if(! gl.getProgramParameter(program,gl.LINK_STATUS))
    {
      console.error('Unable to initialize the shader program.');
      return;
    };
  gl.useProgram(program);
  const texture = gl.createTexture();
  gl.activeTexture(gl.TEXTURE0);
  gl.bindTexture(gl.TEXTURE_2D,texture);
  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL,true);
  gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_MAG_FILTER,gl.NEAREST);
  gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_MIN_FILTER,gl.NEAREST);
  gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_WRAP_S,gl.CLAMP_TO_EDGE);
  gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_WRAP_T,gl.CLAMP_TO_EDGE);
  gl.bindTexture(gl.TEXTURE_2D,null);
  buffers.vertexBuffer = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER,buffers.vertexBuffer);
  gl.bufferData(gl.ARRAY_BUFFER,new Float32Array(vertex),gl.STATIC_DRAW);
  buffers.vertexIndiceBuffer = gl.createBuffer();
  gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER,buffers.vertexIndiceBuffer);
  gl.bufferData(gl.ELEMENT_ARRAY_BUFFER,new Uint16Array(vertexIndice),gl.STATIC_DRAW);
  const aVertexPosition = gl.getAttribLocation(program,'aPos');
  gl.vertexAttribPointer(aVertexPosition,3,gl.FLOAT,false,0,0);
  gl.enableVertexAttribArray(aVertexPosition);
  buffers.trianglesTexCoordBuffer = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER,buffers.trianglesTexCoordBuffer);
  gl.bufferData(gl.ARRAY_BUFFER,new Float32Array(texCoords),gl.STATIC_DRAW);
  const vertexTexCoordAttribute = gl.getAttribLocation(program,"aVertexTextureCoord");
  gl.enableVertexAttribArray(vertexTexCoordAttribute);
  gl.vertexAttribPointer(vertexTexCoordAttribute,2,gl.FLOAT,false,0,0);
  const samplerUniform = gl.getUniformLocation(program,'uSampler');
  gl.uniform1i(samplerUniform,0);
  return (arrayBuffer,width,height)=>{
    gl.bindTexture(gl.TEXTURE_2D,texture);
    gl.texImage2D(gl.TEXTURE_2D,0,gl.RGBA,width,height,0,gl.RGBA,gl.UNSIGNED_BYTE,arrayBuffer);
    gl.drawElements(gl.TRIANGLES,6,gl.UNSIGNED_SHORT,0);
  };
};
Page({
    "onShareAppMessage"(){
      return {
        "title":'camera',
        "path":'page/component/pages/camera/camera'
};
    },
    "data":{
        "src":'',
        "videoSrc":'',
        "position":'back',
        "mode":'scanCode',
        "result":{},
        "frameWidth":0,
        "frameHeight":0,
        "width":288,
        "height":358,
        "showCanvas":false
},
    "onReady"(){
      this.ctx = wx.createCameraContext();
    },
    "init"(res){
      if(this.listener)
      {
        this.listener.stop();
      };
      const canvas = res.node;
      const render = createRenderer(canvas,this.data.width,this.data.height);
      this.listener = this.ctx.onCameraFrame((frame)=>{
      render(new Uint8Array(frame.data),frame.width,frame.height);
      const {frameWidth,frameHeight} = this.data;
      if((frameWidth == frame.width) && frameHeight == frame.height)
        return;
      this.setData({
          "frameWidth":frame.width,
          "frameHeight":frame.height
});
    });
      this.listener.start();
    },
    "takePhoto"(){
      this.ctx.takePhoto({
        "quality":'high',
        "success":(res)=>{this.setData({
            "src":res.tempImagePath
})}
});
    },
    "startRecord"(){
      this.ctx.startRecord({
        "success":()=>{console.log('startRecord')}
});
    },
    "stopRecord"(){
      this.ctx.stopRecord({
        "success":(res)=>{this.setData({
            "src":res.tempThumbPath,
            "videoSrc":res.tempVideoPath
})}
});
    },
    "togglePosition"(){
      this.setData({
        "position":(this.data.position == 'front')?'back':'front'
});
    },
    "error"(e){
      console.log(e.detail);
    },
    "handleShowCanvas"(){
      const that = this;
      this.setData({
        "showCanvas":! this.data.showCanvas
},()=>{if(this.data.showCanvas)
      {
        const selector = wx.createSelectorQuery();
        selector.select('#webgl').node(this.init).exec();
      }});
    }
});

